Bar-grinding machine



Juf-ne 5, w23.' 1,457,845 J. S. LOCHHEAD BAR GRINDING MACHINE Filed April 8, 1922 2 Sheets-Sheet l l FIV-l* N ma l im w3 BAR GRINDI NG MACHI NE 80 and in that respect give actual illustration in place of the diagrammatic showing of Patented .lune 5, 1923 UNEIVE STATES Param ortica.. r

JAMES S. LOGHHEAD, OF PITTSBURGH, I-EINNSYI'A'` BANG-BINDING MACHINE.

Application med April s, 1922. serial No. 550,595.

To all whom t may cncem: I,

Be it known that I, JAMES S. LooHHEAD', residing at Pittsburgh, in the county of legheny and State of Pennsylvania, a citizen of the United States, have invented or discovered certain new and useful Improve-.

ments'in Bar-Grinding Machines, of which improvementsthe following is a specification.

My invention relates to machinesl foring machine for steel bars embodying my inve tion; Fig. II is a view of the -samemaonine in vertical section, on the plane indi-l cated at II-II, Fig. I. Figs. I and II are in some degree diagrammatic. Figs. III and IV illustrate the mounting of themotors by which-the grindingdisks are driven,

Figs. I and II, but otherwise Figs. III and IV` are views in transverse vertical section, on planes lindicated by the lines III `-III and IV-IV, Figs. II and 1 respectivel Fig. V is a view corresponding to Fig. and illustratin an adaptation of the machine to a particular service. Fis. VI and VII are views corresponding to Figs. I and II, and illustrating permissible variations in arran ment.

Re erring first to Fi are provided for impe ing a steel; bar of polygonal cross section with opposite parallel faces (in this instance a rectangular bar B) along a predetermined pathway. These means consist of a pair of pinch rolls 1, 1, and a tension device 2. These two means are remote one from another, and a bar impelled by them, first by the rolls 1, then b both the rolls and the tension device 2 an ultimately by `the tension device alone, will be carried across the intervenin interval, where it is exposed to the grinding instrumentalities. An arrow indil I and II, means Cates the direction of bar advance. The

inch rolls require no detailed explanation. Ihe 'tension device or puller consists yessentially of a screw or screws 3 .(a pair ofthem is shown, extensible and retractable in a base or standard 4, with means of elitension and retraction, found in a motor 5, said screws carrying a yoke 6 armedwith barengaging jaws 7. In this instance it will be 4seen that. the bar-engaging jaws are essentially cam disks which, freely turning, engage the bar frietionally from opposite s ides, the security of the grip being increased b traction strain.

It will e understood froln what has been said that a bar longer than the intervalbe' tween pinch rolls and tension device may `be introduced between and initially impinch rolls 1, and presently, ent 76 pelled by gaged by e tension device 2, may be car-` ried forward by both means of impulsion acting together, and ultimately carried through the last portion of its pathway of advance by tension device 2 alone. Supple-I mentary pinch rolls 8, 8 may be stationed adjacent the point where the tension device 2 first engages the work, as shown in` Fig. I. It is possible to dispense with the tension device described, and employ merely the two sets of pinch rolls 1, 1 and 8, 8, properly spaced a art, but I prefer to lemploy the tension evice, and to provide the rolls 8 primarily as guiding means and if desired,V

as supplementary bar-impelling mean's.

Careful consideration of Fi I and II of the drawings will make psin the fact that'identically such a bar moving st1tuc-v ture as is made up of the yokev withits screws 3 and their driving mechanism, 'mayr be used as means for pushing the bar from behind, ,and a pusher so constituted ma'y combined with pinch rolls or witha ten;-

sion device, such as that specifically shown,

as may be found convenient or desirable.

In the'interval between the bar impelling means the pathway of the 'bar is borderedv b the grinding instrumentalities.-. Each grin ing unit is a disk of abrasive material mounted for rotation on its axis, and provided with suitable driving means.

The grinding `face of the disk is its flat face. These grinding units arev grouped in a plurality of sets, the number of sets crresponding to the shape of the bar: if the bar be rectangular there are two sets; if

be made and will be fully understood, that the sets are so arranged, that the opposite .grinding disks of the several sets, placed in proper angular relation, grind pair by pair, the opposite faces of the bar.

Fig. I shows in plan form above the sets of disks and their driving means which in this instance grind the opposite y,vertically disposed faces of the' rectangular bar 'B travelling through the machine from right to left, and (being, accurately speaking, a section on the plane L-I,- Fig. II) indicates also the `grinding/nneans for the upper and lower horizontally disposed faces; Fig. II shows in side elevation the disks with their driving 4means for grinding the upper and lower faces of the bar and, being a view in section on the line II--II, Fig. I,l

4indicates the means for grinding the vertical faces also. Each set of grlndlng means consists of a plurality of disks 9, with their faces coincident on either side with the limitin planes of the pathway of bar advance. In t 1s case there are ten disks in each set, live on eachiside. The axes of the disks are erpendicular to the line of bar advance. Elach disk is rotatedv by its own motor l0, and reference to Figs. III and IV will show that disk and motor constitute a unit, adjustable ina carrying base orv foundation. Thus the components of the assembly may be accurately adjusted to service conditions.

The particular setting of the successive disks and the quality of the individual disks will be such as to effect complete and finished I grinding in one traverse of the bar through the assembly vof disks from end, to end: ordinarily the disksat the right-hand end of the lines will be coarse grained, those at the left-hand end line' grained; the number will be adequate to effect the necessary progressive grinding. These matters require mere mention, the rest is apparent to those skilled in the art.

In the intervals between roll-passes and disks and between successively arranged disks guide plates 13 may be provided, further .defining the pathway of bnr advance.

This same machine of Figs. I and ll iiij tended primarily for grinding rectangular bars, may be adapted 'for grinding round bars, and the natureand character ot the adaptation is sufficiently indicated in Fig. V. Here the gripping jaws 7 o'f' the tension device 2 are shown to be rotatable 'coaxially with bar B (in this case a round bar), and

rotation `maybe imparted to the yoke -irom' the same motor 5 which turns the screws 3. It rolls'iS be mere guide rolls, lacking any unehing and bar impelling'charactcr, they will be mounted in stationary housings and will not revolve on thel axis of bar advance For adapting this machine to the grinding of round bars one or both sets of disks may be employed; and if both, the opposite disks of the two sets will be spaced not at different intervals, as for the rectangular bar B, of equal length and breadth, but at equal intervals. i

Figs. I and II show the disks of each set arranged in opposite pairs. This is a good, but not a necessary arrangement; Figs. VI and VII show them variously arranged. Figs. I and II show the two sets of disks arranged in interlocked sequence, a pair of one set followed by a pairof the second set, and then a pair of the first set succeeding. T his too is a matter which admits of variation. Figs. VI and VII show'the two sets arranged to` a'ct in sequence, one beginnin after the other has finished. Figs. I and II show an arrangement for carrying through a rectangularbar without any turning, and to f this end one set of disks is arranged in one general plane and the other inl another enrangement necessitates separatiorgof the two sets at an interval greater than 'the len th of the bar to be ground. And in Figs. I and' VII the zig-zag line a indicates this hiatus, and the place where the bar under grind. ing is turned.

In the modified machine 'ofFigs VI and VII .the tension device of Figs. I-III isnot employed, but instead cooperating sets of pinch rolls l and 8, a pair at each end of each set of disks. i

lOperation involves, first, the proper`set fing and adjustment of the several grind-V ing disks (andvitwill beobserved from Figs, 'III and IV that adjustment may by means of screws l1 and l2 be made While operation-is in progress). The bars to be ground are advanced from right to left along the pathway indicated. They are engaged initially by the pinch rolls l and in due course bythe coordinated bar impelling means, whether rolls 8 or tension device 2 or both, andby such means the bars are carried in succession in continuous' progress through the machine. I/Vhile the forward end of a newly entering bar is advancing from pinch rolls l through the pathway between the disks, the tension device may be advancing to meot it, from retracted position to the position shown in Figs. I and II, Wheremeeting the newly advancing bar its direction of traverse is reversed and its jaws automatically engage the bar. As the bar 'so impelled advances, it is ground from end to end and on every side and completely., by the las disks v.' And theJ whole grinding operation is performed in a single traverse through the machine,

I claim as my invention:

In' amachine for grinding in a single't'raverse the surfaces of steel bars as they advance uninterruptedly through the machine, the combination of a plurality -of grinding disks arranged With their flat grinding facesextending in the opposite bounding planes, of the pathway of'bar advance, the

said discs being rotatable on axes perpendic- .nlar to the line of bar advance. a pair of feeding rolls arranged on the intake side of the assembly of. disks andadapted to engage a bar onopposite sides and impel it from behind along the pathway between said disks, and a tension device including. bar-gripping jawsand a rotatable stem screw-threaded in a stationary block arranged on the delivery' JAMES sf LOCHHEAD, Witnesses. I

"BAYARD H. Cnnus'ryzy FRANCIS J. TOMAssoN; 

